Detector  device and CT inspection system having the same

ABSTRACT

Disclosed is a detector device, comprising: an adjustable positioning base and a detector module. The adjustable positioning base includes: a horizontal plate being able to fixedly connect onto an annular rotation table or disk; and a vertical plate extending from the horizontal plate and generally perpendicular to the horizontal plate. A horizontal through long groove is provided at one side of the vertical plate, and the detector module is able to fixedly installed in said horizontal through long groove of the adjustable positioning base. By employing the technical solution defined in the present invention, the detector device has a compact structure, and precision adjustment and positioning for the detector device can be achieved. In addition, the present invention also provides a CT inspection system having the above detector device.

FIELD OF INVENTION

The present invention belongs to radiation detecting technical field,which relates to a CT security inspection system, particularly, to adetector device used for a CT security inspection system, moreparticularly, to a detector device use for a CT security inspectionsystem having a collimator and being adjustable and preciselypositioned.

BACKGROUND OF INVENTION

In the detector device in the prior art for CT security inspectionsystem, detector array in the detector module is arranged on thepositioning support, an adjustable collimator is generally installed infront of the detector module, thereby, the entire detector device isstructured. The structured detector device described above has followingshortages and problems: first, the volume of the detector deviceemploying above structure is too big, therefore, the occupied space ofthe entire CT security inspection system is increased; second, since itis required to adjust related position relationship among the radiationsource, the collimator, the detector module and the positioning support,the adjusting operation, especially the adjustment for the collimatorare complicated, so that the installation and the regulating for theposition of the detector device are inaccurate. Furthermore, sine thesealing of the detector device is not very well, the poor workingstability of the detector crystal is caused.

SUMMARY OF INVENTION

Accordingly, an object of the present invention is intended to overcomeat least one aspect of the shortages and problems existing in the priorart.

Accordingly, one of other objects of present invention is to provide adetector device having a compact structure.

In addition, another object of the present invention is to provide adetector device having a collimator and being able to precisely adjustand position, wherein a detector installed thereon can be preciselyadjusted so as to be adopted in the CT inspection system.

Still an object of the present invention is to provide a CT inspectionsystem to rapidly and easily adjust and position the detector device.

Still a further object of the present invention is to provide a detectordevice avoided from the interference caused by electromagnetic wave,temperature and humidity so that working stability of the detectordevice is ensured.

According to an aspect of the present invention, it provides a detectordevice comprising: an adjustable positioning base, which including: ahorizontal plate being able to be fixedly connect onto an annularrotation table or disk; and a vertical plate extending from thehorizontal plate and generally being perpendicular to the horizontalplate, wherein a horizontal through long groove is provided at one sideof the vertical plate; and a detector module, which is able to befixedly installed in the horizontal through long groove of theadjustable positioning base.

In one embodiment, a zigzag structure is provided at the top of one sideof the vertical plate, the zigzag structure is formed by a convexportion and a concave portion, the concave portion is used for receivingtransmission wires of the detector module.

Preferably, a notch is further provided at the bottom of the horizontalthrough long groove, and radiation protection material is embedded inthe notch.

In one embodiment, the horizontal plate is provided with at least oneconvex stage, a guide slot is opened on the at least one convex stage,and a limitation guide wheel is provided in the guide slot and is ableto slide along the guide slot.

Furthermore, the at least one convex stage is further provided with amicrometer head fixed onto the annular rotation disk through a supportfor adjusting the position of the detector device and locking thedetector device.

Alternatively, the at least one convex stage includes two convex stages,the micrometer head is respectively provided on the two convex stages,the micrometer head is fixed onto the annular rotation table or diskthrough the support, for adjusting the position of the detector deviceand locking the detector device.

In one embodiment, the projection, which the adjustable positioning baseprojects on the horizontal plane, has a shape selected from one of arcline, fold line, straight line and multi-sections of arc lines.

In another embodiment, the shape of the cross section of the adjustablepositioning base on the vertical plane is substantially an inversedT-shape.

In a further embodiment, the detector device further comprises a datacollection circuit provided at another side on the vertical plate, whereis opposite to the side on which the detector module is provided, forcollecting the data produced by the detector module.

Preferably, radiation protection material for preventing the radiationpenetrating therethrough is provided at the side of the vertical plateon which the detector module is provided.

In one embodiment, the detector module comprises a two-levels energydetector array constituted by a high energy detector array and a lowenergy detector array.

In another embodiment, the detector module further comprises acollimator integrated in front of the detector module, the collimatorincluding: a base having comb structures opposing to each other in anup-and-down manner; andradiation protection partition boards providedbetween the comb structures opposing to each other up-and-down forpreventing radiation from penetrating therebetween.

Preferably, the detector module further comprises a shielding cover forcovering the adjustable positioning base and detector module, and awindow is opened at a place where the shielding is rightly faced to thedetector module, a foil is connected to the window to cover the window.The shielding cover is used to shield any electromagnet field and anyvariation of the outside environment that may cause interference to thedetector module.

Preferably, the limitation guide wheel is constituted by ahigh-precision bearing and a pin roll fitted with the high-precisionbearing.

According to another aspect of the present invention, it is provided aCT inspection system, comprising: a rotation disk rotating about aninspection passage; a radiation source provided at one side of therotation disk, for generating radiation rays; a detector device providedat another side of the rotation disk generally opposing the radiationsource, the detector device comprises: an adjustable positioning basebeing able to be fixedly connected onto the rotation disk; and adetector module fixedly installed onto the adjustable positioning base,wherein the adjustable position base includes: a horizontal plate beingable to be fixedly connected onto the annular rotation disk; and avertical plate extending from the horizontal plate and beingsubstantially perpendicular to the horizontal plate, wherein thedetector module is able to be fixedly installed on the vertical plate ofthe adjustable positioning base.

In one embodiment, the CT inspection system further comprises: a datacollection system for receiving and processing the data signal producedby the detector module.

Preferably, the CT inspection system further comprises: a radiationsource control unit for supplying electrical power to the radiationsource to control the operation of the radiation source.

In another embodiment, the radiation source is one of X-ray source,isotope radiation source and gamma-ray source.

At least one aspect of above technical solutions of the presentinvention has following advantages:

Since the detector module is installed onto the adjustable positioningsupport, more particularly, into the positioning groove of the inversedT-shaped adjustable positioning base, the detector device with a compactstructure can be obtained. Furthermore, with the above technicalsolutions, the precise positioning during the installation of thedetector device can be achieved without any other separate or additionaladjusting collimator. In addition, since the shielding cover seals thedetector module, it will not be interfered by electromagnetic wave,variation of the temperature and humidity, so that working stability ofthe detector device is ensured.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top view of a CT inspection system having a detector deviceaccording to an embodiment of the present invention;

FIG. 2 is a section view taken along I-I line of the detector device ofFIG. 1;

FIG. 3 is a top view of an inversed T-shaped adjustable positioning baseof the detector device according an embodiment of the present invention;

FIG. 4 is a section view taken along II-II of FIG. 3;

FIG. 5 is a front section view of the high, low energy detector modulehaving a grid collimator according to an embodiment of the presentinvention;

FIG. 6 is a left side view of FIG. 5; and

FIG. 7 is a partial enlarge view of FIG. 6.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

Preferred embodiments of the present invention will be describedhereinafter in detail with reference to the attached drawings, whereinthe like reference numerals refer to the like elements throughout thespecification. The present invention may, however, be embodied in manydifferent forms and should not be construed as being limited to theembodiments set forth herein; rather, these embodiments are provided sothat the present disclosure will be thorough and complete, and willfully convey the concept of the invention to those skilled in the art.

FIG. 1 shows a CT inspection system 1 including a detector deviceaccording to one embodiment of the present invention. As shown in FIG.1, the CT inspection system includes an annular rotation table or a disk10 provided inside a door-shaped frame (not shown), for rotating about arotation axis (referring to the central axis perpendicularly passingthrough the paper in FIG. 1) under the driving action of a drivingdevice (not shown). Preferably, the rotation axis is parallel to adirection along which the object to be inspected, for example, luggageenters into a the inspection passage 11 of the inspection system 1.

CT inspection system 1 further comprises a radiation source 20 and adetector device 30, which are provided onto positions on the rotationtable or disk 10 opposing each other. In an embodiment, the radiationsource 20 is one of X-ray source, isotope radiation source and gamma-raysource. According to the embodiment of the present invention, referringto FIG. 2, the detector device 30 comprises an adjustable positioningbase 40 and a detector module 50 fixedly connected onto the adjustablepositioning base 40.

In addition, the CT inspection system 1 further comprises a datacollection system (not shown in the Figures) for receiving andprocessing the data signal produced by the detector module; and aradiation source control unit (not shown in the Figures) for supplyingthe electric power to the radiation source to control the operation ofthe radiation source in different conditions. In a further preferredembodiment, the CT inspection system 1 is preferably configured with acomputer system for processing the output of the data collection systemand producing a signal necessary for operating and controlling of the CTinspection system 1.

In an embodiment, after a tapered radiation beam generated by theradiation source 20 is passed through the object to be inspected, forexample luggage, which is transferred forwardly along the inspectionpassage 11, it is received by the detector module 50 on the detectordevice 30, and then, a signal representing the density of the object tobe inspected is produced from the detector module 50. At the same time,if the annular rotation table or disk 10 is rotated about the rotationaxis thereof, so that the radiation source 20 and the detector device 30are also rotated about the inspection passage 11. As a result, each ofthe plurality of projections is generated at each of the plurality ofthe angles of projections. Next, the signal produced by the detectormodule 50 is received and processed by the data collection system (notshown) so as to determine the suspicious contents or the like in theobject to be inspected base on the processed result.

Refer to FIG. 2, the detector device 30 comprises an adjustablepositioning base 40 and a module 50 fixed connected onto the adjustablepositioning base 40. As shown in FIGS. 1 and 3, the detector device 30is provided on the annular rotation table or disk 10 along a section ofarc generally centered at a target A of the radiation source 20, andopposite to or opposing the target A of the radiation source 20 withrespect to the inspection passage 11. It should be noted that, althoughin above embodiment, the adjustable positioning base 40 and the detectormodule 50 is provided along the section of arc generally centered at thetarget A of the radiation source 20, the present invention is notlimited thereto, any other alternative form can be applied. For example,the detector device 30 can be configured to be fold lines connected withpredetermined angles at both sides of the inspection passage 11. In oneembodiment, the detector device can also be configured to be two or moresections of arc generally centered at the target A of the parallel toeach other about the inspection passage 11. In another embodiment, thedetector device 30 can be further configured to be one section of astraight line opposing the target A of the radiation source 20.

FIG. 2 is a sectional view illustrating the detector device 30 takenalong with a straight line I-I connected the target A of the radiationsource 20 to the detector device 30. FIG. 3 is a top view illustratedthe adjustable positioning base 40 of the detector device 30. FIG. 4 isa sectional view taken along with the straight line II-II connected thetarget A of the radiation source 20 to the detector device 30. For clearpurpose, in FIG. 4, the detector module 50 fixedly connected onto theadjustable positioning base 40 is removed.

As shown in FIG. 4, the adjustable positioning base 40 is constituted byan arched vertical plate 41 and an arched horizontal plate 42 being ableto fix on the annular rotation table or disk 10. As shown in FIG. 3, theprojection of the arched vertical plate 41 and the arched horizontalplate 42 on the horizontal plane is a section of arc generally centeredat the target A of the radiation source 20. As shown in FIG. 4, in thecross section taken along the straight line II-II connected the target Aof the source radiation 20 to the detector device 30, the adjustablepositioning base 40 has an inverted T-shape. One side of the archedvertical plate 41 is uniformly provided with a concave-convex portionwith zigzag shape, as shown in FIG. 3, the concave-convex portion isconstituted by a concave portion 49 and a convex portion 43. The concaveportion 49 is used for arranging transmission wires of the detectormodule 50 so as to easily facilitating management of the wiring of thetransmission wires. Also, by employing above configuration, the space ofthe detector device is saved, thereby the structure of the detectordevice is more compact.

As shown in FIG. 4, a horizontal through long groove 44 is provided atthe position which is at the same side as the zigzag concave-convexstage on the arched vertical plate 41, i.e., the side opposite to theradiation source 20, so that step portions 44A are formed at both endsof the horizontal through long groove 44. When the detector module 50 isinstalled in the horizontal through long groove 44 of the archedvertical plate 41 of the adjustable positioning base 40, stage portions44A are used for positioning reference of the detector module 50 so asto rapidly and easily position the detector module 50.

In an embodiment, a fleet notch 45 is opened at the bottom surface ofthe horizontal through long groove 44. Before the detector module 50 isinstalled to the horizontal through long groove 44 of the archedvertical plate 41 of the adjustable positioning base 40, a radiationprotection material 90 is embedded in the fleet notch 50. Further, asshown in FIG. 2, a radiation protection material 91 is also covered onthe remaining portion of the front surface (the surface facing theradiation source 20) of the arched vertical plate 41 on which thedetector module 50 is installed. The radiation protection material 91 isthe same as the radiation protection material 90 embedded in the fleetnotch 44, or they can be different from each other. In an embodiment,the radiation protection material 90 and 91 may be one selected frommetal Pb or W. Through providing radiation protection material on thesurface, faced to the radiation source 20, of the arched vertical plate41, a data collection circuit 80 at the rear surface of the archedvertical plate 41 is effectively prevent from the damage caused by theradiation passing through.

Refer to FIGS. 1-3, two convex stages 46 are symmetrically protrudedfrom the arched horizontal plate 42 of the adjustable positioning base40. An arched guide slot 47 and an arched bolt hole 48 are separatelyopened on convex stages 46. Limitation guide wheel 70 is fixed in thearched guide slot 47 and able to slide along the arched guide slot 47,thereby, the movement track of the detector device 30 is defined.Although two convex stages 46 are symmetrically provided on the archedhorizontal plate 42 in above embodiment of the present invention, thepresent invention is not limited thereto, the number of the convex stagecan be one or more. In one preferred embodiment, the limitation guidewheel 70 is formed by a pin roll 26 with steps and a high-precisionbearing 27, thus it is ensured that the limitation guide wheel 70precisely moves along the arched guide slot 47, and the distance offsetof the detector device 30 in respect to the target A of the radiationsource in the direction of the circumference of the arched section isreduced.

Refer to FIG. 1, a micrometer head 60 is provided at one side of theconvex stage 46, for adjusting the position of the detector device 30and lock the detector device 30. The micrometer head 60 is fixed on theannular rotation table or disk 10 through a support 82. In a preferredembodiment, in order to prevent the displacement under the detectordevice 30 being rotated along with the annular rotation table or thedisk 10, the micrometer head 60 is respectively and symmetricallyprovided at both sides of the convex stage 46. Thereby, when thedetector device 30 is rotated along with the annular rotation table ordisk 10, the two micrometer heads 60 is able to produce a self-lockingfunction, therefore, undesirable displacement is effectively avoided.Furthermore, a fasten screw 81 is provided on the convex stage 46, afterthe position of the detector device 30 is adjusted, the fasten screw 81is screwed into the arched bolt hole 48, so that the detector device 30is further fixed on the annular rotation table or disk 10.

Hereafter, refer to FIGS. 5-7, the structure of the detector module 50according to an embodiment of the present invention is described. Asshown in FIGS. 5 and 6, in an embodiment, the detector module 50comprises a bottom plate 51, a high energy crystal circuit 52 as a highenergy detector array is provided at a front surface of the bottom plate51, i.e., the surface facing the radiation source, a low energy crystalcircuit 54 as a low energy detector array, and a partition board 53provided between the high energy crystal circuit 52 and the low energycrystal circuit 54. Therefore, a structure of two-level-energy detectorarrays is formed by employing above high energy crystal circuit 52 andthe low energy crystal circuit 54.

Although the detector module in above embodiment employs a structure oftwo-level-energy detector arrays, the present invention is not limitedthereto. For example, the detector module may employ a structure ofsingle-level-energy detector array or detector arrays of multi-levelsenergy, of which level is more than two,. When the single-level-energydetector array structure is employed, the partition board 53 isaccordingly removed. When the structure of multi-levels energy detectorarrays, of which the level is more than two, are employed, a pluralityof partition boards 53 may be provided between two of a plurality ofdetector arrays.

In addition, as shown in FIG. 5, a collimator is further integrallyprovided in front of the detector array structure, for collimating andcalibrating the radiation emitted from the radiation source. As shown inFIGS. 6 and 7, the collimator comprises a base 55 with a structurehaving comb portions opposite to each other in a up-and-down manner, aplurality of partition boards 56 preventing the radiation from passingthrough, the plurality of partition boards 56 respectively provided incomb portions opposite to each other in up-and-down manner on the base55, each detector crystal is provided between two adjacent combportions. Thereby, a collimator having a grid structure is formed byemploying above configuration. Furthermore, as shown in FIG. 5, thecollimator further comprises a radiation protection plate 58 provided toface to one side of the radiation source, a spacer 57 is furtherprovided between the radiation protection plate 58 and the base 55, forincreasing the distance between the radiation protection plate 58 andthe base 55.

In above structure, since the collimator is directly integrated in thedetector module 50, so that the structure of the detector module 50 ismore compact, and a complicated adjusting positioning process for thecollimator in respect to the detector module is avoided. Structuralcomponents of above detector module 50 are assembled by screws 59,thereby the detector module 50 is structured.

It should be noted that, in above embodiment, the detector module 50employs the two-level energy detector having the high energy crystalcircuit 52 and the low energy crystal circuit 54. However, the presentinvention is not limited thereto, a single-level energy detector or amulti-level energy detector may be employed.

Refer to FIGS. 2 and 4, the detector module 50 structured as above ismounted in the horizontal through long groove 44 of the arched verticalplate 41 of the adjustable positioning base 40, so that the detectordevice 30 is formed. As shown in FIG. 2, in an embodiment, a shieldingcover 92 is provided at the outside of the adjustable positioning base40, which is used for covering the adjustable positioning base 40 andthe detector module 50 and shielding electromagnetism as well asenvironmental changes. An elongated window 94 is opened at a surface,which is faced to a detector crystal 93, of the shielding cover 92 toallow the radiation to enter into the detector module 50. Since theshielding cover 92 seals the detector module 50, the detector 50 is notinterfered by electromagnetic wave, variation of temperature andhumidity, so that the working stability of the detector device 30 isensured. In order to control and adjust the radiation energy levelintroduced onto the detector module, a metal foil is provided at thewindow 94, for example, an aluminum foil 95 is connected to the window94 to cover it.

Next, the positioning process of the detector device 30 according to thepresent invention is further described by referring FIGS. 1-3.

As described above, the detector module 50 is mounted into thehorizontal through long groove 44 of the arched vertical plate 41 of theadjustable positioning base 40, such that the detector device 30 isstructured. Compared with the technical solution in the prior art, inwhich the detector array is arranged on the positioning support, sincethe detector module 50 takes the step portion 44A of the horizontalthrough long groove 44 as a positioning reference thereof, so that thedetector device 50 can be positioned rapidly and easily. At the sametime, since positioning for the detector module 50 is achieved byemploying the adjustable positioning base 40, adjusting and positioningfor the detector array in the prior art are avoided.

Next, the detector device 30 is mounting onto the annular rotation tableor disk 10 of the CT inspection system 1. Here, all of fasten screws 81are released, any one of micrometer heads 60 is initially rotated tomake it retract back, and then another micrometer head is rotated toallow it to push the convex stage 46 to move forwardly. Here, under theguiding of the limitation guide wheel 70 inside the arched guide slot 47of the convex stage 46, the detector device 30 is rotated about thetarget A of the radiation source 20 along a predetermined track definedby the arched guide slot 47, so that the precise positioning for thedetector device 30 is achieved. After the adjusting and positioning forthe detector device 30 is completed, fasten screws 81 are screwed intoarched bolt holes 48, so that the detector device 30 is further fastenedonto the annular rotation table or disk 10. Thereby, adjusting andpositioning for the detector device 30 are completed.

Although a few embodiment of the present invention have been shown anddescribed, it would be appreciated by those skilled in the art thatchanges may be made in these embodiments without departing from theprinciples and spirit of the invention, the scope of which is defined inthe claims and their equivalents.

1. A detector device, comprising: an adjustable positioning base,including: a horizontal plate being able to be fixedly connected onto anannular rotation table or disk; and a vertical plate extending from saidhorizontal plate and substantially perpendicular to the horizontalplate, wherein a horizontal through long groove is provided at one sideof the vertical plate; a detector module, which is able to be fixedlyinstalled in said horizontal through long groove of the adjustablepositioning base.
 2. The detector device as claimed in claim 1, whereina zigzag structure is provided at the top of one side of the verticalplate, said zigzag structure is formed by a convex portion and a concaveportion, said concave portion is used for receiving transmission wiresof the detector module.
 3. The detector device as claimed in claim 1,wherein a notch is further provided at the bottom of the horizontalthrough long groove, and radiation protection material is embedded insaid notch.
 4. The detector device as claimed in claim 1, wherein saidhorizontal plate is provided with at least one convex stage, a guideslot is opened on said at least one convex stage, a limitation guidewheel is provided in the guide slot and is able to slide along saidguide slot.
 5. The detector device as claimed in claim 4, wherein saidat least one convex stage is further provided with a micrometer headfixed onto the annular rotation disk through a support for adjusting theposition of the detector device and locking the detector device.
 6. Thedetector device as claimed in claim 4, wherein said at least one convexstage includes two convex stages, the micrometer head is respectivelyprovided on said two convex stages, said micrometer head is fixed ontothe annular rotation table or disk through the support, for adjustingthe position of the detector device and locking the detector device. 7.The detector device as claimed in claim 1, wherein the projection, whichthe adjustable positioning base projects on the horizontal plane, has ashape selected from one of arc line, fold line, straight line andmulti-sections of arc lines.
 8. The detector device as claimed in claim1, wherein the shape of the cross section of the adjustable positioningbase on the vertical plane is substantial inverted T-shape.
 9. Thedetector device as claimed in claim 1, further comprising: a datacollection circuit provided at another side on the vertical plate, whereis opposite to the side on which the detector module is provided, forcollecting the data produced by the detector module.
 10. The detectordevice as claimed in claim 9, wherein a radiation protection materialfor preventing the radiation penetrating therethrough is provided at theside of the vertical plate on which the detector module is provided. 11.The detector device as claimed in claim 1, wherein the detector modulecomprising: a two-level energy detector array constituted by a highenergy detector array and a low energy detector array.
 12. The detectordevice as claimed in claim 1, further comprising: a collimatorintegrated in front of the detector module, said collimator including: abase having comb structures opposite to each other in a up-and-downmanner; and a radiation protection partition board provided between saidcomb structures opposite to each other in a up-and-down manner.
 13. Thedetector device as claimed in claim 1, further comprising: a shieldingcover for covering the adjustable positioning base and detector module,a window is opened at a place where the shielding is rightly faced tothe detector module, a foil is connected to the window to cover saidwindow.
 14. The detector device as claimed in claim 4, wherein thelimitation guide wheel is constituted by a high-precision bearing and apin roll fitted with said high-precision bearing.
 15. The detectordevice as claimed in claim 1, wherein a step portion is respectivelyformed at both ends of the horizontal through long groove to be used asa positioning reference of the detector module.
 16. A CT inspectionsystem, comprising: a rotation disk rotating about an inspectionpassage; a radiation source provided at one side of the rotation disk,for generating radiation rays; a detector device provided at anotherside of the rotation disk substantially opposite to the radiationsource, said detector device comprising: an adjustable positioning basebeing able to be fixedly connected onto the rotation disk; and adetector module fixedly installed onto the adjustable positioning base,wherein the adjustable position base includes: a horizontal plate beingable to fixedly connected onto the annular rotation disk; and a verticalplate extending from the horizontal plate and substantiallyperpendicular to said horizontal plate, wherein the detector module isable to fixedly installed on the vertical plate of the adjustablepositioning base.
 17. The CT inspection system as claimed in claim 16,further comprising a data collection system for receiving and processingthe data signal produced by the detector module.
 18. The CT inspectionsystem as claimed in claim 16, further comprising: a radiation sourcecontrol unit for supplying electrical power to the radiation source tocontrol the operation of the radiation source.
 19. The CT inspectionsystem as claimed in claim 16, wherein the radiation source is one ofX-ray source, isotope radiation source and gamma-ray source.
 20. The CTinspection system as claimed in claim 16, wherein a zigzag structure isprovided at the top of one side of the vertical plate, said zigzagstructure is formed by a convex portion and a concave portion, saidconcave portion is used for receiving transmission wires of the detectormodule.
 21. The CT inspection system as claimed in claim 16, whereinsaid horizontal plate is provided with at least one convex stage, aguide slot is opened on said at least one convex stage, a limitationguide wheel is provided in the guide slot and is able to slide alongsaid guide slot.
 22. The CT inspection system as claimed in claim 21,wherein said at least one convex stage is further provided with amicrometer head fixed onto the annular rotation disk through a supportfor adjusting the position of the detector device and locking thedetector device.
 23. The CT inspection system as claimed in claim 21,wherein said at least one convex stage includes two convex stages, themicrometer head is respectively provided on said two convex stages, saidmicrometer head is fixed onto the annular rotation table or disk throughthe support, for adjusting the position of the detector device andlocking the detector device.
 24. The CT inspection system as claimed inclaim 16, wherein the projection, which the adjustable positioning baseprojects on the horizontal plane, has a shape selected from one of arcline, fold line, straight line and multi-sections of arc lines.
 25. TheCT inspection system as claimed in claim 16, wherein on a cross sectionof the adjustable positioning base, which is taken along with a lineardirection connecting the target of the radiation source to the detectordevice, the adjustable positioning base has a substantial invertedT-shape.
 26. The CT inspection system as claimed in claim 16, furthercomprising: a two-level energy detector array constituted by a highenergy detector array and a low energy detector array.
 27. The CTinspection system as claimed in claim 16, further comprising: acollimator integrated in front of the detector module, said collimatorincluding: a comb shaped base; and a radiation protection partitionboard, wherein the radiation protection partition board is inserted intosaid base to form a grid-typed structure.
 28. The CT inspection systemas claimed in claim 16, further comprising: a shielding cover forcovering the adjustable positioning base and detector module, a windowis opened at a place where the shielding is rightly faced to thedetector module, and a foil is connected to the window to cover saidwindow.
 29. The CT inspection system as claimed in claim 16, wherein ahorizontal through long groove is provided at one side of the verticalplate; the detector module is able to fixedly installed in saidhorizontal through long groove of the adjustable positioning base. 30.The CT inspection system as claimed in claim 28, wherein a step portionis respectively formed at both ends of the horizontal through longgroove to be used as a positioning reference of the detector module.